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IMG. 12.

2. A short furnace of simple construction, such as ust-d in
Turner's method for estimating carbon in steel (Fig. 12). It
should carry an iron trough about
30 cm. (12 in.) long, iixed at such
a height that it can be heated by
an ordinary Bunsen burner.

3.  A combustion tuth\ which may
be   rather   longer   than  that,   used
in   the estimation  of carbon   and

4.  A short Jtard s^Itiss ////V, 25
28 cm. (10—II in.) long", and closed at one end.

5.  A bent tube with a bull^ blown in the centre, as shown at
rt, Fig. 13.    This is attached by rubber corks to the cuds of the
long and short combustion tubes.

6.  A graduated Schffis Azotometer, Fig. 13............A small quan-
tity of first poured into the bottom of the tube so as
to fill it 4—5 mm. above the lower side limb.    A solution  of
potash (i KOH : 3HaO) is then poured into the glass reservoir,
which is attached to the upper straight side limb by a  rubber
tube.    By raising the reservoir and opening the tap the tube is
filled, and remains so on closing the tap and lowering the reser-
voir.    When the tube is filled with potash solution then; should

be sufficient mercury at the bottom to seal off the potash solu-
tion from the bent limb, which connects with the combustion
7-  Two flasks, 200 c.c. ami 300 r.r.—Tlie necks are slightly